Well its now running but im very confused
But a big thanks to all who helped.
1 wouldnt start when i got it, turn the key and all dash lights up but when you start , nothing, no click from solenoid no dimming of the dash
2 put a jump lead from battery -ve to cam cover . Started immediately
3 alternator seized so took it off and freed it off and reinstalled and started perfectly still using jump lead
4 fitted a heavy bit of battery cable from inner wing earth lug to a bolt on the cam cover
5 didnt try starting it , went home
6 in the morning i went in to start and starter fired up lovely but no spark, then all the tests we talked about on the thread.
7 put jump lead back on from battery -ve to cam but still didnt start
8 then this morning i went back to the beginning. Took off the earth i had installed, put the Jump lead on and it fired up!!!!!!
What the!!!!!
Put on a different earth lead direct from bolt at battery post to the bolt on the cam and it has started perfect ever since.
Why does the wing earth bolt kill the spark? When its running and i put my failed earth lead on it still runs but wont start if i leave it there.
Im fairly car ( admittedly mostly pre odb but manage to keep my post obd cars running too) and tec savy and cant get me head round this one
Anyone able to explain?